Dominance of S-1(0) proton-pair emission in the O-16(e,e'pp) reaction

The reaction O-16(e, e'pp) has been studied at a transferred four-momentum (omega, \q\) = (210 MeV, 300 MeV/c). Evidence has been obtained for direct knockout of proton pairs from the 1p shell. The excitation-energy spectrum of the residual nucleus and the missing-momentum densities indicate that knockout of a S-1(0) pair dominates the reaction, while there is also a noticeable contribution from knockout of P-3 pairs